One pot synthesis, crystal structures and properties of two new MOFs with imidazole-containing tripodal ligand

Abstract

Two new different Cu(II) MOFs with the same 1,3,5-tris(1-imidazolyl) benzene (tib) ligand {[Cu(tib)2]·(H2O)2·Br2} n (1) and {[Cu2(tib)·Br·Cl]·2Br} n (2) were obtained by one pot synthesized of tib with CuBr in the presences of HCl and water. X-ray single crystal diffraction analyses indicate that both complexes 1 and 2 have two dimensional frameworks containing different building blocks. Each Cu(II) atom in complex 1 is coordinated by four N atoms from different tib ligands. However, there are two different cryptographic Cu(II) atoms in complex 2, one is four coordinated by two bromine atoms and two N atoms from different tib ligands, the other is six coordinated by two chloride atoms and four N atoms from different tib ligands. The thermal gravimetric analysis of complexes 1 and 2 are depicted in the paper.